 2025 Sun Hydraulics 1 of 2

MODEL

DRAX

2-way, pilot-to-shift directional valve with drain to port 4 - normally closed

SERIES 1 / CAPACITY: 2 L/min. / CAVITY: T-21A

(L)CONTROL

L Standard Screw Adjustment

C Tamper Resistant - Factory Set

(A)ADJUSTMENT RANGE

A 1000 - 3000 psi (70 - 210 bar), 1000 psi

(70 bar) Standard Setting

C 2000 - 6000 psi (140 - 420 bar), 2000

psi (140 bar) Standard Setting

(N)SEAL MATERIAL

N Buna-N

V Viton

MATERIAL/COATING

Standard Material/Coating

/AP Stainless Steel, Passivated

NOTE: DATA MAY VARY BY CONFIGURATION. SEE CONFIGURATION SECTION.

The normally-closed, direct-acting 2-way directional cartridge with external drain is a pilot unloading valve used to

sense pressure in one circuit to switch or unload a valve in a different circuit. When pressure at port 1 exceeds the

setting of the valve, the spool shifts to connect port 2 to port 3.

TECHNICAL DATA

Cavity T-21A

Series 1

Capacity 2 L/min.

Maximum Operating Pressure 350 bar

Maximum Valve Leakage at Reseat 20 drops/min.

Reseat >85% of setting

Valve Hex Size 22,2 mm

Valve Installation Torque 41 - 47 Nm

Adjustment Screw Internal Hex Size 4 mm

Locknut Hex Size 15 mm

Locknut Torque 9 - 10 Nm

Seal kit - Cartridge Buna: 990021007

Seal kit - Cartridge Polyurethane: 990021002

Seal kit - Cartridge Viton: 990021006

Model Weight 0.20 kg.

sunhydraulics.com/model/DRAX

TECHNICAL FEATURES

The pilot area (port 1) and the spring chamber drain (port 4) are positively sealed.

There is spool leakage between the work ports (ports 2 and 3)of less than 20 drops/min (1,4 cc/min).

The valve is designed to not modulate and is the equivalent of a hydraulic pressure switch.

Incorporates the Sun floating style construction to minimize the possibility of internal parts binding due to excessive installation torque and/or cavity/cartridge

machining variations.

Model Code Example: DRAXLANCONFIGURATION OPTIONS